Answer Posted / kishore

HashMap is not synchronized.
If u want to synchronized we have to do
HashMap map=java.util.Collections.synchronizedMap(new
HashMap());
Hash Map permits Key and values are Null.

Is null function in java?

1102

---

What is the use of isempty in java?

1075

---

What is the difference between equals() and?

1258

---

Is nan false?

1040

---

What is a constructor, constructor overloading in java?

1041

---

What are the topics in core java?

1126

---

How can we make string upper case or lower case?

1137

---

If an application has multiple classes in it, is it okay to have a main method in more than one class?

1055

---

What is files manifesting?

2253

---

Can we access instance variables within static methods ?

1150

---

List the different types of classloaders in java.

1013

---

Which is bigger double or float?

1030

---

Are static members inherited to sub classes?

1186

---

In a container there are 5 components. I want to display all the component names, how will you do that?

2245

---

Why is a constant variable important?

996

---